31 Jul
2015
31 Jul
'15
10:43 a.m.
-----Original Message-----
From: cctech [mailto:cctech-bounces at classiccmp.org] On Behalf Of David
Gesswein
Sent: 31 July 2015 02:52
To: cctech at classiccmp.org
Subject: Re: Reforming capacitors (technical description, not politics)
When I reformed the 1967? capacitors in MARCH's straight 8 I took some
data
showing the improvement in leakage and also measured
capacitance and ESR.
I
couldn't find original spec for the capacitor but
the values seemed
reasonable
compared to datasheet for more recent capacitors.
Graphs here.
http://www.pdp8online.com/shows/vcfe15/slides/PDP-8_Restoration.html
David,
From the slides you posted it looks like you have some
kind of automated set
up. Can you explain what you have there? The limited reforming
I have done
has been done manually. I also notice that you reform over quite a few
hours, but those are big caps. Not sure I have seen any suggestions over how
long to reform for, and whether it is a function of the capacitor's nominal
capacitance.
Thanks
Rob